Add flip vertical feature on decode #166
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#129
This PR adds a vertical image flip option on decode with SPNG_DECODE_FLIP_Y, and adds it to the documentation.
I did some OpenGL image loading to check if it worked
![upside_down](https://user-images.githubusercontent.com/39204944/116820159-25c3b300-ab39-11eb-9b02-43596bca8259.png)
![flipped](https://user-images.githubusercontent.com/39204944/116820170-307e4800-ab39-11eb-8d42-d1643a8cd277.png)
(decoded with no flags)
(decoded with SPNG_DECODE_FLIP_Y)